Pump



june 3 1924. 1,496,115

L. L. BORNHOLDT PUMP Filed June 22. 1923 gwucntoz Patented June 3, 1924.

"' STATES LOUIS L. BORNHOLDT, 0F yHIGHMORE, SOUTH DAKOTA.

PUMP.

Application filed June 22, 1923. Serial No. 646,992.

To all whom it may concern:

Be it known that Lotus L. BORNHOLDT, a citizen of the United States,residing at- Highmore, in the county of Hyde and State of South Dakota,has invented certain new and useful Improvements in Pumps, of which thefollowing is a specification.

This invention relates to certain new and useful improvements in pumps,and has particular reference to air pumps of the solid pistonrectilinear type.

The primary object of the invention 1s to construct a pump of the abovetype wherein the air intake is of a novel form and is provided with ashut-off valve for rendering the check-valve thereof inoperatlve so thatthe device may be effectively employed for testing compression incylinders of gasoline engines or the like.

Another object of the invention is to embody the'above features in apump in such manner as to render the construction extremely efiicient,simple and durable.

With the above general objects in view, and others that will becomeapparent as the nature of the invention is better understood, the sameconsists in the novel form, combination and arrangement of partshereinafter more fully described, shown inthe accompanying drawing, andclaimed.

In the drawings, wherein like reference characters indicatecorresponding parts in the two views,

Figure 1 shows a pump constructed in accordance with the presentinvention, partly in elevation, partly in vertical section, and partlybroken away, and

Figure 2 is a top plan view of the device shown in' Fig. 1 with partsremoved.

Referring more in detail to the drawing, the invention embodies a base 5of elongated form, and preferably consisting in a heavy casting as isusual with pumps of this character. As shown in Fig. 1, the base 5 isprovided with a lon itudinal passage 6 having upwardly extending flangedports 7, 8 and 9 which open through the upper end of the base and spacedapart and in alinement with each other longitudinally as indicated inthe figures. The base 5 is provided with an upstanding internallythreaded socket 10 at one end of the same with which the port or opening9 is concentric and the lower end of a pump barrel 11 1s threaded mtothis socket as shown in F1g. 1. A piston head '12 is verticallyreciprocable .in the cylinder 11 and is attached to the piston rod 13which extends upwardly througha cap 14 suitably provided on the upperend of the barrel 11. The piston 12 is preferably of the constructionshown embodying oppositely positioned cup-shaped lever members providedwith filler blocks and clamped tightly together upon the threaded lowerend portion of thepiston rod 13 by means of nuts 15. Any suitable meansmay be provided for the convenience of reciprocation of the piston rod13.

The base 5 is provided with a relatively small internally threadedsocket l6 eccentric with and surrounding the intermediate port 8, andthe lower end of a tube 17 is threaded into this socket 16 as shown inFig. 1, the upper end of the tube 17 being provided with any suitableform of check valve 18 which is spring pressed at 19 to normally closeand open in the cap 20 provided in the upper end of the tube 17. Themanner of 7 use and purpose of this check valve is well ton 12 forallowing air to be readily drawnthrough the tube 17, port 8, passage 6and port 9 into the lower end of the pump valve 11. The check valve 18automatically seating upon the downstroke of the piston 12 for causingthe air to be forced through the outlet port 7. In order to render thecheck valve 18 inoperative so as to prevent air from being drawn intothe cylinder 11, a cutoff valve 21 is placed in the tube 17 between thecheck valve 18 and the port 8. This cutoff is preferably in the natureof a hand clutch adapted for manual operation by means of a handle 22,although any desired form of cutoff valve may be provided.

The wall of the port 7 is threaded for reception of the nipple 23 whichis provided.

- pump when the same is in use.

From the foregoing it will be seen that when the device is employed as acompression pump for inflation of tires or like uses, the cutoff valve21 will be opened and the device operated in'the usual manner.Howinvention as claimed.

\Vhat I claim as new is v 1. In an air pump of the solid pistonrectilinear type, a base, said base having a pas sage provided withthree'upwardly extending ports, a pump barrel attached to the base insurrounding relation to one of said ports, an air intake tubeattached'to the base and surrounding an intermediate one of said ports,a check valve carried by said tube, a (-utott' valve carried by the tubebetween the check valve and the intermediate port of the base, and anoutlet hose connected with the remaining port of the base.

2. In a pump of the class described, a base having a passage providedwith three ports, a pump barrel attached to the base in surroundingrelation to one of said ports, a check valve in operative relation toanother of said ports for permitting the passage of air to the passageupon the section stroke of the piston of said barrel, means associatedwith the last named port between the passage and the check valve forcutting ofi' communication of said port with the atmosphere and anoutlet hose oppositely associated with the remaining port of the base.

In testimony whereof I aflix my signature.

LOUIS L. BORN HOLDT.

